Microchip Technology ATAK51005-V1 User Manual Download

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• “LF Challenge” – Displays the 4-byte LF challenge data that was sent to the fob. This challenge data is sent

during bilateral and unilateral authentication.

• “LF Encrypted Challenge” – Displays the 4-byte LF encrypted data sent to the fob during bilateral authentication

only.

• “RF MAC” – Displays the received RF MAC value from the fob.
• “Localization” – Displays the current localization status of the current fob (for example, inside or outside the

vehicle). This is determined by comparing the distance scale value against the “In/Out Threshold (RSSI)” value
displayed in the System Configuration window (see

Figure 5-4

Note:

The fob section is highlighted in blue if the fob is found “inside” and pink if the fob is found “outside.” This

allows for an easy determination from a distance while the range of the system is being tested.

• “Distance Scale” – Indicates the RSSI scale value received.
• “Coil Phase Signature” – Displays a three-digit binary code (see the following table):
•

Table 5-2. Coil Phase Signature Calculation

Bit
Position

Calculation Using Coil Phase Clock
Count Values

Bit Value (If 90° < Calculated Result
< 270°)

Bit Value
(Otherwise)

Z − Y value

360 value x 360

Z − X value

360 value x 360

Y − X value

360 value x 360

Note:

The Z-Y, Z-X, Y-X and 360 coil phase clock count values are found in the “PEPS Fob Actions” section of

the System Configuration window.

• “TOF Measured (cm)” – Displays the Time of Flight measured between the vehicle and the fob.

Notes:

• The Relay Attack icon appears when both ATA8352-XPRO boards are connected and the “TOF Measured

(cm)” value is greater than the “Relay Attack Threshold (cm)” value or if the fob does not return a measured
value.

• The Battery Low icon appears if the fob returns a low voltage warning indicating the battery voltage is

below 2.6V (approximately).

• “Log PEPS transaction to file ” – Selecting this check box creates a new record line in a CSV document for each

received message when it is selected.

• “PEPS Commands” – This section includes controls for initiating various PEPS functions and their associated

authentication used.

– “Start/Stop” – This button initiates either the start or stop PEPS function depending on the status of the

vehicle.

– “Unlock” – This button initiates the unlock PEPS function.
– “Lock” – This button initiates the lock PEPS function.
– “Unilateral and Bilateral Authentication” – Selecting either of these radio buttons has an effect on the type

of communication used during the selected PEPS commands.

5.3.3

Identifying FOBS within LF Range

Identify the available fobs by sending out a broadcast, which returns the Fob# in the selected fob field. Perform the
following steps to identify the available fobs within the LF range:

If not done already, follow the procedure detailed in

4. CARS Kit PC Evaluation Utility

In the System Configuration window, choose

Broadcast

from the “Selected Fob” drop-down list (see

Figure

5-5

Click the

Fob ID

button to send the broadcast request. The available fobs respond with their fob IDs and their

Fob# assignments. The “Fob Vehicle ID” field displays the returned vehicle ID.

Click the